<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>生成器函数实例</title>
</head>

<body>
    <script>
        //异步编程 文件操作 网络操作（ajax,request) 数据库操作
        //1s 后控制台输出 111 2s后输出 222 3s后输出 333 

        setTimeout(() => {
            console.log(111);
            setTimeout(() => {
                console.log(222);
                setTimeout(() => {
                    console.log(333);
                }, 3000);

            }, 2000);
        }, 1000);


        function one(){
            setTimeout(()=>{
                console.log(111);
                iterator.next;
            },1000)
        }


        function two(){
            setTimeout(()=>{
                console.log(222);
                iterator.next;
            },2000)
        }


        function three(){
            setTimeout(()=>{
                console.log(333);
            },3000)
        }

        function * gen(){
            yield one();
            yield tow();
            yield three();

        }

        //调用生成器函数
        let iterator = gen();
        iterator.next();

    </script>

</body>

</html>